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W. H. HARRIS s; G. FARR. I

FURNACE FOR STATIONARY BOILERS.

PatentedJan. 10,1882.

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Patented Jan. 10 188 2.

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- FURNAGB "F02 STATIONARY BOILERS.

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STATES PATENT OFFICE.

WILLIAM. H. HARRIS, OF BROOKLYN, AND GEORGE FARR, OF NEW YORK, N. Y.

FURNACE FOR STATIONARY BOILERS.

SPECIFICATION forming part of Letters Patent No. 252,214fdated January 10, 1882.

Application filed December 7, 1881. (No model.)

To all whom it may concern:

B'e it known that we, WM. H. HARRIS, of Brooklyn, Kings county, and GEORGE FARR, of New York, in the county of New York and State of New York, have inventedoertain new and useful Improvements in Furnaces for Stationary Boilers; and we do hereby declare that the following is a full, clear, and exact description of the invention,which will enable others skilled in the art to which it appertains to makeand use thesame, reference being bad to theaccompanyin g drawings, and to the letters of reference marked thereon, which form a part of thisspeci'fication.

Thisinvention relates to improvements in furnaces andboilers of the stationary type.

Our invention is applicable to a variety of boilers, but we will illustrate it by means of the ordinary flue of tubular boiler and its objects are, first, to prevent incrustation on the boilershell of the boiler by furnishing it with pure water; second, the nearly perfect combustion of fuel by meansof a proper supply of heated air and at'the proper place or places, third, disposing'of the fuel in such manner that all the combustible gases will be consumed, and thereby the avoidance of smoke and economy of fuel.

In the drawings hereto annexed, Figure lilln'strates' avertical longitudinal section through the center of the boiler; Fig. 2, a vertical transverse section of the same; Fig. 3, aborizontal section, and Fig. 4 a face view of the bridge-wall. I

A is the boiler, B the grate-bars, and O the ash-pit; D E, frontand rear combustion-chambers; F, throat formed between the pendent partition and the forward projection',G,of the top of the bridge-wall. His the rear flue, and I the rear connection. J are fire-tubes.

When it is intended to carry the outgoing products of combustion over the boiler for the purposeof superheatin g the steam or for heating air the chimney is placed at the rear end of the boiler. Then they pass through return smoke-connection K and over the boiler to the uptake; but in ordinary cases the smoke-stack may be placed justoverthe smoke box or connection K in the usual way. The location of the smoke-box, however, is immaterial to our invention.

We will now describe the functions and ep- 1 the boiler.

eration of that portion of our invention just above pointed out.

Fuel being fed to the furnace in the usual way, and the fire being started some time, the air in the air-fluesbecomes heated. As soon as the fire becomes incandescent and steam is raised the blast is put on, either by means of a fan-blower or a steamdujection pipe. The air-flues extend twice around the furnace, so that it becomes thoroughly heated, and in this condition itisforced out through the apertures a in the side of the front combustion-chamber, and also through the air-outlets in the projection of the bridgewall. The tire now beingin good condition the gases evolved from the fuel in the front chamber are forced beneath 1 the pendent water-partition and come in contact with the gases and intense flamein the rear combustion-chamber, and evolving from this the combustible gases are again met with another blast of heated air at the throat of the bridge-wall, with which they are intimately mixed, and in this condition they form acomiplete chemical union,become ignited and entirely consumed, so that no smoke or combustible gases escape. This pure flame and intense beat-ismade to impinge on the heating-surface of the boiler. Said surface being free from soot and oxidation, the heat is rapidly taken up and transmitted to the water in Thus economy of fuel is the result, and a clear avoidance of the smoke nuisauce.

The second feature of our invention is locating across the combustion-chamber a hollowpendentwater-partition,L,dividin.g the furnace ehamber into two-via, front and rearas before described. The top of this partition is flat and slightly arched on the bottom, and

way, for the reason that any sediment ormud precipitated and deposited on the bottom of the heater naturally seeks the lowest level. The lowest part of the heater is in the coolest part of the furnace, so should any accumulation of sediment remain the heater will not be injured. In this way the water is entirely cleansed of any foreign substances that may enter with the feed-water before its introduction into the boiler, and hence noinerustation is formed on the boiler-plate and tubes, and, as before stated, the heat is more rapidly'transmitted through it than when it is in adirty-or. muddy condition. Theboiler and tubes also last longer, for the reason they will not burn or blister while plenty of water is in immediatecontact with boiler-plate and tubes. The introduction of the water to the boiler is gradual, and well distributed through all parts of the boiler by means of the perforated pipes. By the purity of the water in the boiler foaming and priming is almost entirely avoided. But should it happen, from agitation or other causes, watershould rise and saturate the steam too much, the separators in the dome will liberate all the steam from the water, and thus dry steam is carried to the engine.

The feed-pipes and blow-off pipes maybe located as may be required by the boiler-setting. The various steam-boiler appliances are not shown, as they will suggest themselves. I

The location and arrangement of air heating and distributing flues will be readily seen at Fig. 3. v v

Referring,- again, to the rear combustionehamber, E, it will be seen it extends under the bridge-wall projection, forming a hooded chamber. This hooded chamber plays a very important part in the perfect combustion that takes-"place there, and in this way, that a large mass of incandescent feed is placed just at the'point where it meets the gases from the front COmbustiOmchaInber, and if the layer were thin they would readily rush'through it without being consumed; but by the mass of incandescent coals there the gases are retarded until they have time to unite with the air and become thoroughly mixed, when the mixture readily ignitesand is instantly consumed, and thus the formation ofsmoke is avoided.

We are fully aware that pendent partitions wall,f0r manyattempts have been made in this direction; but we are not aware that pendent independent hollow water-partitions arched, connected, and adapted to be cleaned like ours have ever before been used. Neither are we aware that any such an arran gementof heatingflues with their capped projecting perforated bridge-wall and apertures leading into the fire on the other side of the pendent partition have been used.

We do not therefore claim any former arrangements; but

What we do claim is- 1. A furnace divided by an independent water partition into front and rear combustionchambers, said combustionchambers being surrounded by air-heating flues arranged to twiceencircle said furnace, said flues terminating in side apertures in the front chamber and in a series of perforations in the bridgewall in an upper forward projection, whereby the gases are made to mix with theheated air and become ignited and thereby consumed in the manner described.

2. The combination, in a heating-furnace consisting in a divided furnace-cham ber, of a hollow arched pendent partition, a hollow bridge-wall having a forward-projecting hood or cap forming a hooded chamber beneath it, as described, and a series of air-heating flues encircling the furnace and within the walls, adapted to supply heated air to the side'apertnres in the front combustion-chambers and to the perforations in the hood or projection in the bridgewall in the manner set forth and described.

3. The combination, in a steam-boiler furnace,of the arched pendent partition arranged and located as described, the feed-water pipe, the central perforated pipe, the outside circulating-pipe, terminating in a perforated pipe at right angles thereto, and the blow-oft pipe,

' all arranged forjoint operation in the manner WILLIAM HENRY HARRIS. GEORGE FARR.

Witnesses:

G. W. BALLOOII,

GEO. S. BALLOOH. 

